Electrofilter



1952 J. H.' LINDBERGH ET AL 2,616,516

' ELECTROFILTER 2 SHEETS-SHEET 2 Filed May 3, 1949 o o o u o o o o 0 o o o 0 o o o c 0 o o a o o 0 0 o o a o 0 o 0 c c a o o o o o o o a o a o n o o o o o o o o o 0 a a o o o o o o a o o o 0 o o o o c 0 a a 0 0 Ml W5 Patented Nov. 4, 1952 2.616.516 ELECTRQFILTER John Helge Lindbergh; Stockholm, and Gustaf Larsson, Jonkoping, Sweden, assignors to A B Svenska Flaktfabriken, Stockholm, Sweden Application May 3, 1949, Serial No. 91,188 In Sweden-Apri1 22, 1949 The present invention relates to an improved 2 Claims. (01. 1837) embodiment of electro-filters for purifying gases by precipitation of dust and other deteriorations on special precipitating electrodes arranged 1n the filter. In earlier known embodiments of such filters the electrodes have been arranged as.

straight wires freely suspended from the top of, the filter on springs and weighted in the lower part and held together by means of hooks and couplings. This arrangement has, proved to have several disadvantages, among other things, poor wire strength and difficulties in adjusting the position of the wires in the filter.

The principal object of the invention is to pro duce an improved and simplified arrangement for the assembly itself as well as for support and adjustment of the electrode system. Th invention makes it possible to place emission electrodes and precipitating electrodes very near each other without risk of a break down. This is dependent upon the accurate adjustment .of the electrode system in the gas stream which now may be effected. In this way it also becomes possible in practice to work with lower voltage distances and due to this maintain a higher degree of separation reckoned per filter volume byjthe plant. The electrical equipment of the filter may be dimensioned for lower effect and it is possible, for instance, to choose simpler types of construction of rectifier devices required on account of which the gas purifying equipment will be considerably cheape in production and building as well as in running.

The present invention is characterized principally in that the electrode system consists of a number of emission and precipitating electrodes respectively, arranged between frames at the inlet and outlet ends respectively of the filter, the frames being perpendicular to the longitudinal direction of the filter and provided with fastening means, intended for the electrodes, the fastening means being arranged in pairs and supported by a. rod extendin through the centre of the frames, the rod being united with the high tension insulater or its extension by means of a link consisting of a. fixed upper part and a lower part, be-

however,

in screw form, which have been given a slightly wavy shape and are fastened in rows in the frames between hooks or the like, arranged in pairs and right in front of each other, and the precipitating electrodes are composed of plates disposed between the rows of emission electrodes.

Other characteristic features of the invention are evident from an embodiment more fully described in the following.

The invention will now be more fully described with reference to the accompanying drawings, intended to show an embodiment as an example of the invention. In the drawings:

Fig. 1 shows a vertical cross section of an electro-filter.

Fig, 2 is a horizontal section through the filter from the line 11-11 in Fig. 1.

Fig. 3 in a larger scale shows the link, arranged between the high tension leader and the electrode system according to Fig. 1.

Fig. 4 is a sectional view taken on line 4 of Fig. 3.

The electro-filter shown in Fig. 1 comprises an upper chamber I3 and a lower chamber 5 surrounding the raw gas inlet 3, and the purified gas outlet 32, respectively. Between the upper and the lower chambers, collecting electrodes and an emission electrode system are enclosed in an ininterposed gaskets or the like.

ing rotatable or displaceable respectively and/or termed'iat-e chamber 9. The walls of the intermediate chamber have supports I0 extending vertically along each side, for the entire height of the chamber. The chambers are connected by gas-tight joints formed by means of flanges and In the upper chamber l3 a high tension insulator 2| having an extension 20 is mounted in gas-tight relation by means of gaskets 23, 24, and 25 to a connection piece 26 having a lower portion 2'! which surrounds the lower part of the insulator. This portion 21 of the connection piece 26 is designed as a container for circulating warm water or the like to prevent condensation and deposition of moisture on the insulator which otherwise would increase the risk of flash-over in this part of the filter.

The insulator 2| is provided with a special coupling muff 22 and is fed with a high negative charge from a direct current source not shown. The emission electrode system includes two frames, 8 and M which are provided with paral lel rows of hooks or the like with the corresponding hooks in each row arranged in alignment transversely of the rows. These hooks or the like are provided for the support of the emission electrodes l I. The frames 8 and M are maintained at a set distance from each other by means of a center rod I2. The emission electrodes according to one embodiment of the invention are composed of wires having a slightly wavy shape.

The precipitating or collecting electrodes of the filter are composed of plates 36 disposed in the spaces between the rows of emission electrodes. A convenient way of installing the collecting electrode plates is by welding. Between the supporting rod 12 of the electrode system and the extension rod 20 of the insulator 2|, a link is disposed. In the embodiment shown in the drawings, this link consists of an upper disc I! which is securely fastened to the lower end of 'the insulator extension rod 20 by means of nuts 28 and 29 which are threaded on said rod 28 and support disc I! in a fixed position transversely thereto.

A similar dis-c I6 is provided which is securely fastened upon the upper end of the support rod l2 by means of nuts 30 and 3| which are threaded thereon and support disc [6 in a fixed position transversely to the rod 12.

In accordance with the present invention, the disc [8 is adapted to be adjustably positioned angularly, and to a limited extent, rotatably, with respect to the upper disc l'l. By so positioning disc [8, the entire emission electrode system may be angularly positioned or tilted in all planes passing through the axis of the filter and also may be rotated to a limited extent about the longitudinal axis of the electrode system.

To this end, a plurality. of bolts 38 having heads 37 are mounted in the upper disc I! each equally 'spaced circumferentially thereto, and these bolts 38 extend through suitable enlarged openings 39 provided in the lower disc [8 nuts 40 being threaded on each of the bolts 38 at the inside of the disc l6. Openings 39 in the disc i6 through which the bolts 38 pass are of relatively larger diameter than the diameter of the bolts 38 so that sufiicient clearance is provided for tilting the disc I16 angularly with respect to the axis of the bolts 38 and so that the disc 16 can be rotated to a limited extent with respect to disc ll. In addition to the bolts 38, a plurality of bolts M is threaded upwardly through the lower disc H at equally spaced intervals circumferentially thereof. Preferably the number of bolts 4| employed corresponds to the number of bolts 38 and the bolts 4| and 38 are arranged alternately with respect to each other as shown, for example, in Fig. 4 of the drawings. The upper ends of the bolts M are adapted to engage the underside of the upper disc I! and lock nuts 24 are provided for securing the bolts 4| in the positions to which they may be adjusted. By proper adjustment of the bolts 4| and the nuts 48 on the bolts 38, it will be apparent that the position of the lower disc 15, and consequently the electrode system, may be angularly positioned or tilted with respect to the upper disc I! and the longitudinal axis of the filter device. Because the holes in the plate [6 are larger than the bolts it is also possible to rotate the system to a limited extent. The electrode system is accessible for inspection and adjustment through the lower window 7 and the upper window I5. A gas distributing arrangement '6 is placed immediately inside the gas inlet,

which arrangement in this case is composed of a a frustum of a cone, having the larger base line at the inside following the wall of the lower chamber immediately above the gas inlet 3 and having the smaller base line lying on the bottom of the filter. A number of openings, four in the embodiment shown, are arranged for the inlet of the gas on the sloping envelope surface of the cone. The gas coming in is thus forced to rise uniformly in the filter and is distributed over the whole electrode system. A certain decrease of the gas velocity takes place there too, which contributes to the high precipitating degree by the filter described. In order to prevent the purified gas to gather and settle deteriorations, which possibly are left, on the high voltage insulator, a tube I9 is arranged around said insulator and in front of the tube a horisontal disc l8, which leads the gas towards the outlet 32 for the purified gas.

On the upper part of the connection piece 26 windows (not shown) are arranged for wiping away deposits on the insulator porcelain.

On part 25 of the filter there is also a faucet (not shown) fo de-aerating the filter and prevent explosions on account of remaining air, which has entered the filter and been mixed with the gas at the o enin of one of the inspection windows.

Having now described our invention, what we claim as new, and desire to secure by United States Letters Patent, is:

1. An el'ectro-filter for gases comprising an inlet, an outlet, and an intermediate vertically extending chamber through which gases are adapted to flow from the inlet to the outlet, a plurality of collecting electrode plates extending longitudinally of said chamber, an emission electrode system in said intermediate chamber including a pair of spaced frames and a plurality of parallelro-ws of emission electrodes extending between said frames, said rows being arranged between'the collecting'electrode' plates, a central support member for the electrode systern, an extension member from which the support and electrode system are suspended, said extension member being fixedly mounted at the outlet substantially in alignment with said support member and an adjustable connection between said support member and said extension member, said adjustable connection being angularly adjustable in all planes passin through the vertical axis of said electrode system and also being capable of limited rotation about said axis whereby the emission electrode system may be tiltablv and, to alimited extent, rotatably" adjusted.

2. An electro-filter for gases comprising an inlet, an outlet, and an intermediate, vertically extending chamber through which gases are adapted to flow from the inlet to the outlet, an electrode system in said intermediate chamber ineluding electrode elements extending longitudinally of saidchamber, acentral support member for the electrode system, an extension member from which the supportand electrode system are suspended fixedly mounted at the outlet substantially in alignment with said support member, a disc element fixedly mounted on each of said support andextension members in posiferenti-ally thereof and arranged alternately with respect to the bolts of said first group, said bolts of the second group being adjustable to engage the suspension disc, and nuts on the bolts of the first group, said nuts being adjustable to position the support disc angularly with respect to the suspension disc, the openings in the support disc being enlarged to permit limited rotation of the support disc with respect to the suspension disc whereby said electrode system may be tilted with respect to the vertical axis of said filter and rotated to a limited extent about its own axis.

JOHN HELGE LINDBERGH.

GUSTAF LARSSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

